284 CALIFORNIA ACADEMY OF SCIENCE.S. 



Fig. 2. Section of the seven auterior somites, showing the pharynx and 

 pharyngeal glands. The letters indicate the same as in the previous 

 figure. 



One of the testes in somite xi. 



One of the testes in .somite x. 



A body of peritoneal cells of one of the jjosterior nephridia. 



Part of a septal gland. 



Part of a salivary pharyngeal gland. 



Transverse section of the clitellum. 



Perigastric cells, massed and single. 

 Lower part of one of the posterior nephridia. 

 (. s. ;/■ inter-segmeutal groove. 

 vph. pr. nephridio pore. 

 I>r. r. peritoneal cells. 

 Fig. 11. Auterior part of the cesophageal diverticulum, showing the be- 

 ginning of the lateral collective vessel. Exterior view. 

 drt. exterior of diverticulum. 

 cl. r. collective vessel. 

 Fig. 12. Longitudinal section of the auterior part of the diverticulum, 



showing the lacunary system. 

 ep. I. inner epithelial lining. 

 /. /. interior lacunary system. 

 (h. tube sui^posed to be joined to /. /. 

 rl. r. collective vessel. 

 Fig. 13. A more highly magnified part of the former. 

 ep. I. epithelial lining. 

 f. bloodvessels. 



Plate VI. 



Fig. 14. Nephridium of one of the posterior somites. The peritoneal 



cells in the upper part of the nephridium are not indicated, the 



general outline only being shown. 

 Fig. 15. 0. occidental^. Testis from somite x. 

 Fig. 16. 0. occklental/s. Sperm-sac with duct from somite xi. 



s. septum. 

 Fig. 17. 0. Beddardi. Oviduct. 

 Fig. 18. 0. Beddardi. Sperm duct. 



c. r. ciliated rosette. 



t. testis. 



h. heart; all from somite x. 

 Fig. 19. O. Beddardi. A celloidine section of the diverticulum of the 

 oesophagus in somite ix. The central streamers at a and c are 

 parts of the diverticulum wall and not any interior partitions. 



